Selective ratio transmission for driving calculating machine actuators



y 29, 1945. H. T. AVERY 2,377,065

SELECTIVE RATIO TRANSMISSION FOR DRIVIIIG CALCULATING MACHINE ACTUATORS 15 Sheets$heet 1 Filed No v. 25, 1940 FIE 'L Q Q Q Q Q Q Q Q Q Q Q Q Q Q I N V EN TOR Ham/0 7/41 60 BY y 1945- H. T. AVERY 2,377,065

SELECTIVE RATIO TRANSMISSION FOR DfiIVING CALCULATING MACHINE ACTUATORS Filed Nov. 25, 1940 15 Sheets-Sheet 2 INVENTOR.

Hare/0 TAVc/y BY A TO EYS.

H. T. AVERY 2,377,065

SELECTIVE RATIO TRANSMISSION FOR DRIVING CALCULATING MACHINE AGTUATORS Filed Nov. 25, 1940 15 Sheets-Sheet 3 May 29, 1-945.

May 29; 1945. H. T. AVERY SELECTIVE RATIO TRANSMISSION FOR DR IVING CALCULATING MACHINE ACTUATORS Filed Nov. 25, 1940 15 Sheets-Sheet 4 gwvc/wfm Ham/d Z Avery.

y 1945' H. T. AVERY SELECTIVE RATIO TRANSMISSION FOR DRIVING CALCULATING MACHINE ACTUATORS l5 Sheets-Sheet 5 Filed Nov. 25, 1940 y 1945- H. T. AVERY 2,377,065

SELECTIVE RATIO TRANSMISSION FOR DRIVING CALCULATING MACHINE ACTUATORS Filed'Nov. 25, 1940 15 Sheets-Sheet 6 INVEN TOR.

a A TO EYS.

y 1945. H. 'r. AVERY 2,377,065

SELECTIVE RATIO TRANSMISSION FOR DRIVING CALCULATING MACHINE AcTUAToRs Filed Nov. 25, 1940 l5 Sheets-Sheet '7 FIE ILE INVENTOR. I f/am/df/Ivkv BY 1 ATT R YS.

May 29, 1945.

H. T. AVERY SELECTIVE RATIO TRANSMISSION FOR DRIVING CALCULATING MACHINE AGTUA'IORS Filed Nov. 25, 1940 l5 Sheets-Sheet 8 IN V EN TOR.

f/ora/c/ TAwery May 29, 1945. 2,377,055

H. T. AVERY SELECTIVE RATIO TRANSMISSION FOR D IVING CALCULATING MACHINE ACTUATOR Filed NOV. 25, 1940 15 Sheets-Sheet 9 INVENTOR.

ATTOR YS.

May 29, 1945. H. T. AVERY 2,377,065

SELECTIVE RATIO TRANSMISSION FOR DRIVING CALCULATING MACHINE ACTUATORS Filed Nov. 25, 1940 15 Sheets-Sheet 10 J06 FIE J E y INVENTOR. F E Hare/a TAU my ATTOR a pm WW 3% 2e 9 h S 5 1 y 1945- H. T. AVERY SELECTIVE RATIO TRANSMISSION FOR DRIVING CALCULATING MACHINE ACTUATORS Filed Nov. 25, 1940 INVENTOR. o/o f/ix/e/y May 29, 1945. H. r. AVERY SELECTIVE RATIO TRANSMISSION FOR DRIVING 1 CALCULATING MACHINE ACTUATORS Filed Nov. 25, 1940 l5 Sheets-Sheet 12' INVENTOR. 0/0 TAVe/y May 29, 1945. H. T. AVERY SELECTIVE RATIO TRANSNISSIONFOR D RIVING -CALCULATING MACHINE ACTUATORS m pm W 39 2 m s 5 1 Filed Nov. 25, 1940 lNVENTOR. 49 BY fem/401mg A TTO NEYS May 29, 1945. H. T. AVERY SELECTIVE RATIO TRANSMISSION FOR DRIVING CALCULATING MACHINE ACTUATORS l5 Sheets-Sheet l4 Filed' Nov. 25, 1940 NEYS.

y 1945- H. TVAVERY 2,377,065

SELECTIVE mnommusmssmn FOR DRIVING CALCULATING momma ACTUATORS Filed Nov. 25, 1940 15 Sheets-Sheet 15 INVENTOR.

ATTORNEYS Patented May 29, 1945 SELECTIVE RATIO TRANSMISSION FOR DRIVING CALCULATING MACHINE AC- TUATORS Harold T. Avery, Oakland, Calif., asslgnor to Marchant Calculating Machine Company, a corporation of California Application November 25, 1940, Serial No. 367,025

7 Claims.

This invention relates to a calculating machine of the type designed to perform four cardinal calculations. In the ordinary calculating machine where an entry is to be made a number of times in the accumulator register the operating member is required to make 9, corresponding number of operations.

One of the objects of the present invention is to provide an improved means whereby through a single operation of the operating member, such as a single rotation of a cyclically driven oper ating member or hand-crank, an entry may be made any selected number of times in the accumulator. For such purpose, the calculating machine of the present invention includes a series of transmission gears between the operating member or handwranl; and the actuator of the machine.

It is a further object of the present invention to embody such improvement in a continuous gear type of actuator, commercially known as the Merchant Calculating Machine, as shown for example in the Avery Patent No. 2,271,240.

The improvements of the present invention are particularly valuahleior use in connection with the calculating machines driven by a hand-crank, and it is thus one object of the invention to provide a hand cranindriven calculating machine in which multiplication can he performed by a single operation of the hand-crank.

it is a further object of this invention to provide a calculating machine in which a new multiplier setting can he made before the preced multiplication is complete;

It is a further object of the invention to provide a means operated by thedriving member the machine for actuating and controlling ctof the invention topro a clearing anlsm for the registering:

from the cyc i 'i l hano crankoi ices operated by 1y operate-cl d1" cviuc means whcreioy cyclic operating mem the same has come to her and released rest.

clearing mechanisms Various further objects and advantages-of the calculating machine of the present invention will appear from the following description of the preferred form of machine embodying the present invention, for which purpose reference is made to the accompanying drawings, in which Figure 1 is a top exterior view of the machine, showing the location of the various control members.

Figure 2 is a detailed section, as viewed from the right, showing the members which constitute the centralizing and interlocking means for the selective speed transmission unit.

Figure 3 is a longitudinal section, as viewed from the right, showing the general arrangement of the parts of the machine.

Figure s is a longitudinal section, as viewed from the right, showing part of the selection and actuation mechanism.

Figure 5 is a lateral section taken on the line V-V of Figure 4.

, Figures 6 to 9, inclusive, are detail views of the selection control devices shown in Figures 4 and 5.

Figure 10 is a developed plan view, partly schematic and partly in section, of the selective speed transmission unit, its drive to the actuator and related mechanisms.

Figure 11 is a front view of the members which control the selective transmission unit.

Figure 12 is a sectional view taken on the line XII-XIX oi Figure 13.

Figure 33 is a right side view of the linkage between the control members, shown in Figure ii, and the selective transmission shaft.

Figure 14 is a right side view or the mechanism for releasing and for locking the actuator drive gears. 4

Figure iii is a right side view or the actuator eentralizer and the means tor locking the actuator in full cycle position, and the interlocking means between the actuator and the carriage dippi use to a right side view of the mechanism the selection levers in position while is taking place.

it gins 1'2 is section through th carriage, as viewed. from the right, showing the mechanism :ior tapping the loell to indicate an overdraft.

Figure 17A is a detailed view of means for returning a particular shaft to its normal position.

Figure 18 is an enlarged view, partly in section, of two orders of the'accumulator, showing the construction thereof.

Figure 19 is a section through the carriage, as viewed from the right, showing the lever and related mechanism by which the carriage may be freely traversed in either direction.

Figures 20 and 23 are sections taken through the carriage to illustrate the construction of the accumulators, the section being taken so as to bring out the inter-action and relationship between certain of the-parts.

Figure 21 is a top view of the shift centralizer.

Figure 22 is a top view of the driving means between the shift mechanism and the traversable carriage.

Figure 24 is a section taken on the line XXIV- XXIV of Figure 26.

Figure 25 is a front view of the mechanism shown in Figure 24.

Figure 26 is a right side view of the manual and automatic means for controlling and actuat ing the shifting mechanism.

Figure 2'. -.is a right side view of the mechanism for actuating the counter register and the means for reversing the same.

Figure 28 is a section of the counter reverse unit, as viewed from the rear, showing the means for reversing the action of the counter finger.

Figure 29 is a detail view of the cams and related mechanism which condition the clearing mechanism.

Figure 30 is a right side view of the clearing mechanism and the connections therefrom to the shafts which effect clearance of the, registers.

liIODIFIED EMBODIMENT Figure 31 is a section, as viewed from the right, showing an alternative arrangement for retaining the carriage drive gears in mesh with the actuator for a plurality of actuating cycles.

Figure 32 is a section, as viewed from the right, showing an alternative arrangement for rocking the ordinal cam follows clear of the dial cams during plus actuation.

Figure 33 is an enlarged sectional view, taken on the line HXUI-XXXIII of Figure 31.

Certain of the primary units of the machine embodying the present invention are either taken wholly or slightly altered from the showing in the aforementioned Avery patent. These units will, therefore, be only generally described.

KEY SETTING Arm ACTUATING Mzommsm The numeral keys 15 (Figure l), by means of which the factors are entered into the machine, are arranged in parallel banks of ten keys each, one such bank being shown in Figure 4. Each key I is mounted on a key stem l6,'which is vertically slidable in the slots 1 and 8 in the key bank frame 9. The key stems are normally maintained in raised position by springs 6 compressed between a boss 4 on frame 9 and an opposite lug 5 on the key stem, the body of the key stem being cut away, as shown at 3 in Figure 5, to receive the spring and to provide a cross-bar. Spring clips 30 embrace the key stems [6 adjacent the under-side of the top of frame member 9 and constitute a cushioning stop for arresting the rise of the keys under the influence of springs 5.

Each key bank frame 9 is mounted in the machine on cross-bars I2 and 13, which extend between side frame members, not shown, and a screw 16 extending through the bar I! into contact with each frame 9 may be adjusted so as to correctly position the key frame, which may then be fixed by means of screw 11 extending through a slot in frame 9 into bar 13.

Means are provided for latching depressed value keys in depressed position. Rollers l1 and 88 journaled in members 89 and 90, depending from frame 9, support a plurality of longitudinally slidable bars, including a lock bar 40 (Figures 4 and 5), provided with cam faces 8| underlying each of the key stem cross bars whereby depression of any key will move the bar 40 to the left, as viewed in Figure 4. Underlying all of the key stems, except that of the zero key, situated at the left of Figure 4, the bar 40 is also provided with latching hooks 92 so that as the cross-bar of the key stem passes below the hook 92 the bar 40 may return to the right, as viewed in Figure 4, to latch the key in depressed position. Spring 93 serves to return the look I bar 40 tothe right in such operations.

Means are provided for indicating upon aligned numeral wheels the amount to which the selecting mechanism is set by depression of the keyboard keys. Also, supported upon the rollers 81 and 88 is a longitudinally slidable check dial bar 50 provided with nine evenly spaced notches 59, each having a bottom portion designed to receive the cross-bar of the overlying key stem 18 and divergent sides designed to be engaged by the lower end of said key stem, so that the bar will be moved longitudinally as the key is depressed. The spacing of the notches 53 is slightly less than the spacing of the key stems I6, so that upon depression of any value key the bar 50 will be cammed to the right (as viewed in FIG- ure 4), a distance proportional to the value of the key depressed. The bar 50 does not extend under the zero key, however, and is not affected by depression thereof.

The check dial bar 50 is thus given differential movement proportional to the value of the key depressed and this differential movement is transmitted to the check dial 52, rotatably mounted with other similar check dials on a shaft 53, extending across all decimal orders of the keyboard, so that numerals on the periphery of the dials 52 will be exposed through the sight openings 68.

Each check dial 52 has fixed thereto a pinion 58 operating in engagement with a segment 51 formed on one end of a lever 58 pivoted in the frame of the machine at 61 and provided with a pin 6|, which is engaged by a notch in the check dial bar 50. A spring 93a, tensioned between an ear 95 on the lever 5!, and a. stud 96 on the machine frame urge the lever 58 clockwise about its pivot and thus normally maintain the parts in the position in which they are shown in Figure 4, in which a stop member 91 flxed t each dial 52 bears against one of the teeth of a comb 98 fixed in the machine frame to limit counter-clockwise rotation of the dial 5: to the point at which the zero numeral thereon is exposed through the sight opening Depression of any value key will, therefore, by imparting a differential movement proportional to the value of the key to bar 50 and lever 58, rotate dial 52 clockwise to expose through the sight opening 68 a digit indicating theyalue of the depressed key.

As described in the Avery patent, above referred to, the selection mechanism of the storesaid type of Mai-chant machine comprises three shafts I65, I61, and I68, hereinafter referred to as the half, quarter, and twelfth speed shafts, respectively, and common to all decimal orders of the machine. These shafts are connected to a selective ratio transmission described in said Avery patent, so that shaft I66 rotates through 180 for each cycle of operation of the machine, while shaft I68 rotates through for each such cycle of operation. In each decimal order a sleeve I19 is rotatably mounted on a shaft I19 disposed adjacent the aforesaid actuating shafts, and each sleeve I19 has keyed thereto a plurality of gears through which the several orders of the registering mechanism are driven.

Means are provided for connecting-each sleeve I19 to the actuator gear trains so that it can be either locked or driven by one (if the three shafts I66, I61, or I68 at any of nine different rates with respect to the driving means, said rates corresponding to the values delineated upon the keys I5. Since this mechanism is repeated in each decimal order of the machine, only one such order need be described in detail.

As shown in Figure 4, a gear 41I is keyed to sleeve I 19 and there is mounted to oscillate freely on a spacer mounted on said sleeve alongside gear 41I, a selection plate 412 having rotatably mounted thereon an idler gear 413 and an idler gear 414 entrained with gear 41I. Keyed to the half speed shaft I66 and in radial alignment with gear 413 is a twelve-tooth gear 415, while in radial alignment with gear 413 on its opposite side is a twenty-tooth gear 416 keyed to the quarter speed shaft I61. Thus, if plate 412 is swung to the right (as viewed in Figure 4) gear 413 will be brought into mesh with gear 416', whereupon the 90 rotation of shaft I61 during each cycle of operation of the machine will advance the gear 41I five teeth; while if plate 412 is swung to the left, gear 413 will be carried into mesh with gear 415 and the 180 rotation of shaft I 66 will advance the gear 41I six teeth during each cycle of operation of the machine. By this means, either a five or a six selection may be effected.

Also, keyed to the sleeve I19 is gear 411 (Figure 7) and mounted for'osclllation on a spacer carried by said sleeve alongside of this gear, is a selection plate 418 on which are mounted idler gears 419 and 489,- which are entrained with gear 411. Keyed to shaft H56 in radial alignment with idler 419 is a fourteen-tooth gear 48L and keyed to shaft I61 in radial alignment with idler 419 is a sixteen-tooth gear 582. Thus, when they selection plate 419 is swung to the right (as viewed in Figure '1) its idler 419 will "mesh with the gear 492 and the 90 rotation of shaft I 6'1 in. each cycle will serve to advance the gear 411 four teeth; while, when the said plate 418 is swung toward the left, idler 419 will mesh with gear 46$ and the 180 rotation of shaft I66 in each cycle will serve to advance the gear 411 seven teeth. By this means, either a seven or a four selection may be effected.

Also, keyed upon sleeve I19 (Figure 6) is a 483, and mounted to oscillate freely upon acer carried by the sleeve I19 alongside this is a selection plate 494, similar to those ve described, and carrying idlers 495 and 489. eyed to shaft 589 in radial alignment with idler 495 is a sixteen-tooth gear 491, and keyed to shaft I61 in radial alignment with idler 499 is a twelve-tooth gear 488. Thus, when plate 494 is swung to the left (as viewed in Figure 6) its idler 485 will mesh with gear 481 and the 189 rotation of shaft I66 in each cycle will serve to advance the gear 493 eight teeth; while when plate 484 is swung toward the right, idler 496 will mesh with gear 489 and the 90 rotation of shaft I61 in each cycle of operation will serve to advance the gear 483 three teeth. By this means, either an eight or a three selection may be effected.

Also, keyed to the sleeve I19 is a broad faced gear 189 (Figure 9), and freely mounted for oscillation on a spacer carried by the sleeve I19 on one side of this gear is a selection plate 496, similar to those above described, and mounting idlers 299 and 2!". Keyed to shaft I66 in radial alignment with idler 29 I is an eighteen-tooth gear 493, and keyed to shaft I68 and meshing with a gear 494 rotatably mounted upon shaft I I61 in radial alignment with idler 29I is a twentyfour-tooth gear 495. Thus, if plate 499 is swung to the left (as viewed in Figure 9), idler 29I will mesh with gear 493 and the rotation of the shaft I66 in each cycle will serve to advance the gear I89 nine teeth; while, if the plate 496 is swung toward the right, the idler 29I will mesh with the gear 494 and the 30 rotation of shaft I68 lneach cycle will drive gear 494 through gear 495 to advance the gear I89 two teeth. By this means, either a nine or a two selection may be effected.

Mounted for oscillation on sleeve I19 at the opposite side of gear I89 is another selection plate 496 (Figure 8) having mounted thereon intermeshing idler gears 491 and 498. Gear 498 is constantly enmeshed with gear I89, while gear 491- may mesh with the twenty-four-tooth idler gear 499 rotatably mounted on shaft I61 when the plate 496 is swung to the right (as viewed in Figure 9). twelve-tooth gear 299 keyed on shaft I88 so that gear I99 will be advanced a single tooth upon a 30 rotation of gear 200 when plate 496 is swung to the right.

A zero selection is effected by holding gear I I 89 against rotation. For this purpose, a pawl ZIH (Figures 4 and 8) is mounted upon a shaft 292, so that when the plate 496 is swung to the left (as viewed in Figure 8) the edge of said plate will'engage an car 263 on pawl 28! and retain said pawl in engagement with the gear I89 after the shaft 202 is rocked, as hereinafter described.

The shaft 202 extends across all orders of the machine and one pawl 2M is provided for each decimal order. At the commencement of operation, shaft 292 is rocked counter-clockwise to a limited extent by a mechanism to be presently described, and when the machine comes to rest the shaft is returned in a clockwise direction.

t will be noted that pawl 28! is provided with narrow-keys 264 lying in wider key-ways in the shaft 292, and, therefore, when some value other than zero is selected in a given order the initial counter-clockwise rocking of shaft 282 will free pawl 29E so that upon rotation of sleeve I19 the gear I89 may rock its associated pawl 2M out of the way. However", if a zero is selected in a particular order, the associated plate engaging the lug 299 of the pawl 29L as previously explained, will retain the pawl in engagement with the gearlfiil, notwithstanding the counter-clock wise movement of the shaft .262, because the keyway in which the keys 294 are engaged is wide enough to permit such limited rocking movement of the shaft 992 as is necessary in this opera tion. By this arrangement, when the selection plate 496 is swung toward the left, as viewed in This gear 499 is driven by a.

Figure 8, the gear I89 is locked and the zero selection is effected.

It will be apparent from the foregoing that one of the five selection plates in each order is po-- sitioned during a selection operation to select either a numeral value or zero, while the remaining four plates of that order are held in idle position. l'he value positions are positions in which the plate-carried gears mesh with gears on shafts 166 or l9], while the idle position is the intermediate position of the plates in which no such connection is effected. Thus, if a six is to be selected, by way of example, plate 412 (Figure 4) will be swung to the left to engage gear 415, while all the other plates will beheld in intermediate positions.

The selection plates are set to the several value-selecting and intermediate idle positions, above described, by a series of longitudinally adjustable selection bars supported upon rollers 8! and 88 (Figure 4) alongside the previously described locking bar 43 and check dial bar 59 of each key bank.

For the purpose of effecting a zero or one selection, the plate 495 (Figure 8) is connected to a selection bar 4i!) (Figures 5 and 8) supported on the rollers 81 and 38 and having an extended arm 4!! provided with a slot H2 engaging a pin 413 on selection plate 498, so that upon longitudinal movement of the bar 4H1 the plate 486 will be moved either into its zero, intermediate, or one selection position. Spring 93, tensioned between an ear 94 of the previously described locking bar 40 and an ear 99 of the selection bar 410 urges the bar 4I0 toward the left (as viewed in Figure 8), normally maintaining stop lug 4 against roller 81 and selection plate 496 in its zero selection position, in which it maintains pawl 2M in locked engagement with gear 189. The upper edge of bar M is, however, provided with notches 4 i 8 having divergent sides underlying the cross-bars of each of the key stems l6 of the two to nine value keys, inclusive, the bottoms of said notches lls being sufllciently offset from the lower ends of the key stems to cause the latter to earn bar 4H3 to the right a suflicient distance to move the plate 496 into its intermediate position when one of these keys is depressed.

A similar notch 4|! underlies the cross-bar of the key stem l5 associated with the one value.

key, but the bottom of said notch is oflset from the bottom of said key stem a sufficient distance to cause the depression of said key to cam the bar 4| 0 to the right a suilicient distance to carry the gear 49! mounted on plate 496 into mesh with gear 499 and thus effect a one selection as above described. For the purpose of effecting positive restoration of the plate 495 into its zero selection position upon depression of a zero key, a notch 4l8 underlies the cross-bar of the stem l6 of the zero key of each key bank and. is provided with one divergent edge adapted to cause thebar ill! to be cammed to the left a sufllcient distance to positively move the plate into its zero selection position upon depression of the 'zero key.

The positioning of the selection plate 490, by means of which either a nine or a two selection may be effected, as above described, is controlled When neither the nine nor the two key is depressed, the bar 420 and its connected plate 490 are maintained in their intermediate position by extensions 424 and 425 of the bar 420 which abut opposite sides of the nine key and the two key, respectively, to prevent longitudinalmovement of the bar 420 so long as both of these keys are in raised position.

Underlying the nine key, the bar 420 is provided with a notch 426 having an angular edge 42! adapted to be engaged by the cross-bar of the stem l6 of the nine key, upon depression thereof, to cam the bar 423 to the left (as viewed in Figure 9) and move the plate 490 to carry its gear 291 into mesh with the gear 493 for the purpose of effecting a nine selection as above described. Upon release of the-nine key from depressed position, the upper edge of its cross-bar is adapted to be brought into contact with the cam surface on the extension 424 to return the plate 490 to intermediate position.

Underlying'the two key, the bar 420 is provided with a notch 428 having an angular side 429 adapted to be engaged by the stem iii of the two key upon depression thereof to cam the bar 420 to the right (as viewed in Figure 9), moving plate 490 to bring its gear 29! into mesh with the gear 494 to effect a two selection as above described. Upon release of the two key from depressed position, the upper edge of its cross-bar is adapted to contact a cam surface on the underside of the extension 425 to move the bar 420 and its attached plate 490 to. intermediate position.

The positioning of the selection plate 484 (Figure 6) to effect an eight or three selection, as hereinabove described, iscontrolled by a selection bar 43!! (Figures 5 and 6) having an extension arm 43| provided with a slot 432 engaging a pin 433 on the plate 484, so that upon longitudinal movement of the bar 430 on rollers 81 and 88 the plate 484 may be moved into its eight selection, intermediate, or three selection positions. The bar 430 and selection plate 484 are normally maintained in their intermediate positions by means comprising extensions 434 and 435 of plate 430 which abut opposite sides of the stems of the eight and three keys, respectively, so that no substantial longitudinal movement of the bar 430 is possible unless one of these keys is depressed.

with the gear 491 to effect an eight selection, as

hereinabove described. Upon release of the eight key from depressed position the upper edge of its cross-bar is adapted to contact a cam surface on the underside of extension 434 to return the bar 430 and selection plate 484 to intermediate position as the key rises.

Underlying the stem of thethree key is a notch 439 provided with a divergent edge 439 adapted to be contacted by the stem of the three key upon depression thereof to cam the bar 430 to the right (as viewed in Figure 6) and carry gear 435 on plate 484 into'mesh with gear 488 to effect a three selection, as above described. Upon release of the three key from depressed position, the upper side of its cross-bar is adapted to contact a cam surface on the underside of extension 435 and return the ,bar 439 and plate 484 to intermediate position as the key rises.

The positioning of the selection plate 418 (Figure 7) to efiect a seven or a four selection, as hereinabove described, is controlled by a bar 440 having an extension arm I provided with a slot 442 engaging a pin 443 on the plate 418, so that upon longitudinal movement of the bar 440 on rollers 81 and 88 the plate 418 may be moved into its seven selection, intermediate, or four selection positions. The bar 440 and its connected plate 418 are normally maintained in intermediate position by means comprising extensions 444 and 445 of bar 440 which abut opposite sides of the stems I of the seven and the four keys, respectively, so as to prevent any substantial longitudinal movement of the bar 440 so long as both of these keys are in raised position.

Underlying the stem I6 of the seven key is a notch 446 having a divergent edge 441 adapted to be contacted by the stem of the seven key upon depression thereof to cam the bar 440 to the left (as viewed in Figure '7) and carry the gear 419 mounted on plate 418 into mesh with the gear 48I to effect a seven selection as hereinabove described. Upon release of the seven key from depressed position, the upper edge of its cross-bar is adapted to contact a cam surface on the underside of extension 444 and move the bar 440 and its connected plate 418 to intermediate position as the key rises.

Underlying the stem I6 of the four key is a notch 448 provided with a divergent edge 449 adapted to be contacted by the stem of the key upon depression thereof to cam the bar 440 to the right (Figure '7) and carry gear 419 into mesh with gear 482 to eifect a four selection, as herein- I effect a five or .a six selection, as hereinabove described, is controlled by a selection bar 450 having an extension arm I6I provided with a slot I62 en-- gaging a pin I63 on plate 412 so that upon longitudinal movement of bar 450 on rollers 81 and 88 the plate 412 will be moved into its five selection, intermediate, or six selection positions. Bar 450 and its connected plate 412 are normally maintained in intermediate position by means comprising extensions I54 and I65 of bar 450 abutting opposite sides of the stems of the six and five keys, respectively, to prevent any substantial longitudinal movement of the bar 450 so long as both of these keys are in raised position.

Underlying the stem I6. of the six key is a notch 4M having a divergent edge I 61 adapted to be contacted by a stem of the key on depression thereof to cam the bar 450 to the left (as viewed in Figure 4) and more the gear 413 on plate 412 into mesh with the gear 415 to effect a six selection, as hereinabove desL'llbeld. Upon release of the six key from depressed position, the upper edge of its cross-bar is adapted to contact a cam surface on the under-side of extension I64 to move the bar 450 and its connected plate 412 to intermediate position as the key rises.

Underlying the stem I6 of the five key is a notch 452 having a divergent edge I69 adapted to be contacted by the stem of thekey upon depression thereof, to cam the bar 450 to the right (as viewed in Figure 4), and carry the gear 413 on plate 412 into mesh with the gear 416 to efiect a five selection, as hereinabove described. Upon release of the key from depressed position the upper edge of its cross-bar is adapted to contact a cam surface on the underside of extension I65 to move the bar 450 and its connected plate 412 to intermediate position as the key rises.

Depression of any value key in a given bank serves to release any previously depressed key in the same bank, and if the previously depressed key is associated with a different selection bar to positively return such selection bar and the plate associated therewith to intermediate position. If the previously depressed key is associated with the same selection bar, the said bar will be reset through its intermediate position to a new selection position.

For this purpose, each of the selection bars 420, 430, 444, and 450 (Figures 4, 6, 7, and 9) is provided with a plurality of notches 455, which when the said selection bars are in their intermediate position underlie the stems of the value keys other than those adapted to move the respective selection bars into active position. Each of the notches 455 is provided with divergent edges 454 adapted to be contacted by the cross-bar of a depending key stem I5, so that the latter will cam the bar longitudinally in either direction to intermediate or idle position, as the key is dc pressed. If a given selection bar is in its intermediate or idle position as a key is depressed, the key stem I8 will nter directly into the notch 455 and latch the selection bar against endwise movement in either direction.

Thus, it will be seen on reference, for instance, to Figure 9 that if the nine key stands depressed a subsequent depression of the one key will not only release the nine key and permit its stem to rise under the influence of its spring 6, but the descending stem of the one key will come into contact with the cam surface 454 and positively cam the selection bar 420 to the right (as viewed in Figure 9) until it reaches its intermediate or idle position when the stem of the one key will enter the notch 455 and latch the selection bar 420 in its intermediate or idle position.

Means are provided to lock the plurality of selection plates 412, 484, 418, 496 and 490 (Figures 16, 4, 6, 'l, 8, and 9) in one of their three positions during the actuation period. A shaft I I5 (Figure 16) is rocked counter-clockwise just before the actuation period by mechanisms explained hereinafter. A lever I83 is secured to this shaft and is connected to a lever I84 pivoted on a shaft I88. A selection locking bail I85 is secured to lever I84 and extends across the machine so that a flange I 85 thereon may be moved upwardly into one of the thre notches I81 to look all the selection plates in one of the three positions described hereinbefore. After the actuation cycles are completed, the shaft I I5 is rocked hack to the position shown, which rocking moves the flange I86 out of the notches I81 so the plates may be moved to a new setting indicative of the next selection entered on the keys 85 (Figure l).

Accmwts'roa The actuation of the numeral wheels 219 is effected by mechanism including the above-mentioned pivot gears I 89 (Figure 3) which mesh with the gears 2"II mounted in the shiftable carriage. Gears 213 mesh with the gears 21] and are integral with two plates 292 and 296 (Fi 18) between which are journaled the planetary gears 29.8. These planetary gears revolve about a sun gear 299 and drive the ring gear 218 and its 

